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Physics Flashcards > Formula For Physics > Flashcards

Formula For Physics Flashcards

1
Q

Velocity

A

Velocity=speed/time

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2
Q

What is acceleration

A

Rate of change in velocity

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3
Q

Equation for acceleration

A

Acceleration= change in velocity/time

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4
Q

What is acceleration measured

A

M/s2= metres per second/seconds

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5
Q

2nd formula for acceleration

A

2as= v2-u2

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6
Q

Gradient of distance/time graph shows?

A

The speed the object is travelling

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7
Q

What does the gradient of velocity time graph show

A

The acceleration or decelration of an object

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8
Q

On velocity of time graph how to find the distance

A

Area underneath the curve

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9
Q

What is a force

A

A force is a push or that acts upon an o as a result of that object’s interactions with its surroundings.

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10
Q

What is forced measured in and it sclar/vector

A

It is measured in newtons, and has both magnitude and direction

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11
Q

Contacts force and non contact force

A

Contact force can be only exerted when objects physically touch

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12
Q

Whats newton first law

A

A resultant force is required to change the motion of an object

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13
Q

Whats newton first law

A

A resultant force is required to change the motion of an object

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14
Q

Newton second law

A

A resultant force will cause an object to accelerate in the direction of the force.

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15
Q

What is the equation for force

A

Force=mass x acceleration

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16
Q

Bearings

A

A ‘bearing’ is an angle measured clockwise from the north direction.

For example, in the image above, the vector (the dark blue arrow) is at a bearing of 140°, because it’s 140° clockwise from north.

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17
Q

Formula for weight

A

Weight= mass x gravity

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18
Q

2 factors that dtermine the strength of gravitational force of attraction

A

Distance between objects
The mass of objects

19
Q

Formuala for gravitational potential energy

A

Gravitational potential emergy=mass x gravity x height

20
Q

Key points to understand objects undergoing circukar motioj

A

Key points to understand for objects undergoing circular motion:
The objects changes direction continuously, which changes it’s velocity
This change in velocity means the object accelerates
The acceleration is caused by a centripetal force acting inward

21
Q

What is centripetal force dependent on and how

A

Mass:
Increasing the mass would increase the centripetal force required to keep the object travelling at the same speed with the same radius.

Speed:
Increasing the speed would increase the centripetal force required to keep the object travelling with the same radius and mass.

Orbital radius:
Increasing the radius of orbit would decrease the centripetal force required to keep the object travelling at the same speed.

22
Q

Newtons third law

A

When two obejcts interact they are equal and opposite

23
Q

Mometum formula and units

A

Momentum=mass x velocity

Kg m/s

P=mv

24
Q

The conservation of momentum principle states:

A

The total momentum before the collision is equal to total momentum after the collision

25
Q

Force to momentum equation

A

Force= change in momentum/velocity

F=^p/t

26
Q

What is stopping distance and formula

A

‘Stopping distance’ is the total distance a car travels from the moment when the driver first notices an obstruction, to when the car stops.

Thinking distance + braking distance

27
Q

A vehicle drives twice as fast what occurs to breaking distance

A

The breaking distance gets increased by 4 times

28
Q

Name all energy stores

A

Thermal
Gravitational potential
Elastic potential
Magnetic
Chemical
Electrostatic
Nuclear
Kinetic

29
Q

Way energy can be transferred

A

Mechanically
Electrically
Through heating
Via infrared radiation
Via light or sound waves

30
Q

Open system

A

Can gain or lose energy to oustide world

31
Q

What happens as an object falls

A

s an object falls, energy is transferred from its gravitational potential energy store, to its kinetic energy store.

32
Q

Formula for kientci energy

A

Kinetic energy= 0.5 x mass x velocity2

E=0.5 x m x v2

33
Q

Open vs closed system

A

An open system exchange energy and matter with its surroundings. A closed system exchange energy or matter with the surroundings.

34
Q

Kinetic energy and gravitational potentisl energy

A

As an object rises, KE is converted to GPE
As an object falls, GPE is converted to KE
KE lost = GPE gained and KE gained = GPE lost

Gpe=maximum and KE=minimum

35
Q

Formula for efficiency

A

Efficiency= useful energy output/ total energy output

Efficiency= useful power output/totalnpower output

36
Q

Which of the following are features of a house which help to reduce heat loss by conduction?

A

Fouble galzed windows
Cavity walls
Walls made of a material with low thermal conductivity

37
Q

Reducing friction

A

Fast moving vehicles like cars and planes have a streamlined shape to reduce friction from air resistance. This allows them to use less fuel.

Lubricants

38
Q

Pros and cons of fossil fuels

A

Cheap, can be used in any conditions, current infrastructure requires fossil fuels

Limited resource
Produce carbon dioxide when burnt
Also produce toxic gases

39
Q

Pros and cons of nuclear energy

A

Do not produce pollutants, can be used in any conditions, very unlikely to run out

Technically still finite
Radioactive waste which remians harmful for thousands of years
Expensive

40
Q

Pros and cons of biofuels

A

They’re easy to transport
They’re renewable
They can be used in cars

They require a large areanof land to grow
They require a lot of energy to harvest,process and transport

41
Q

Pros amd cons of solar and wind power

A

They don’t produce any pollutants while operating
They have low running costs

Take up a lot of land and space
Very dependent on weather so inconsistent
Hiave relatively high costs

42
Q

Power dfenition

A

Power is the rate at which energy is transferred, or the rate at which work is done.

43
Q

Power formula

A

P=w/t and p=e/t

Physics Flashcards (3 decks)

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